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Related Concept Videos

Torque Free Motion01:15

Torque Free Motion

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The torque-free motion refers to the movement of a rigid body in space when no external torques are acting upon it. This type of motion can be observed in environments where there are no external forces or frictions, like in outer space. For example, a rotation of Mars in space is a torque-free motion. Mars is an axisymmetric object, meaning it has an axis of symmetry along which it rotates, designated as the z-axis. The rotating frame of reference is defined such that the center of mass of...
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Journal Bearings01:23

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Journal bearings are mechanical components that support and provide lateral stability to rotating shafts and axles. They are crucial in reducing friction, wear, and vibration in machinery such as engines, turbines, and pumps. The principle behind journal bearings is forming a thin lubricant film between the bearing surface and the rotating shaft, which minimizes direct contact and reduces frictional forces.
To better understand the concept of journal bearings, consider a rope winch with dry or...
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Motor Units01:13

Motor Units

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The motor unit is a fundamental component of the neuromuscular system and plays a crucial role in coordinating muscle contractions. It consists of a somatic motor neuron, which connects and controls multiple skeletal muscle fibers, forming a single functional segment. The axon of the motor neuron branches out and establishes synaptic connections known as neuromuscular junctions with individual muscle fibers within the motor unit.
Motor units come in different sizes, with smaller units...
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Motor Units00:46

Motor Units

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A motor unit consists of two main components: a single efferent motor neuron (i.e., a neuron that carries impulses away from the central nervous system) and all of the muscle fibers it innervates. The motor neuron may innervate multiple muscle fibers, which are single cells, but only one motor neuron innervates a single muscle fiber.
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Torque01:10

Torque

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Torque is an important quantity for describing the dynamics of a rotating rigid body. We see the application of torque in many ways in the world, such as when pressing the accelerator in a car, which causes the engine to apply additional torque on the drivetrain. Here, we define torque and provide a framework to create an equation to calculate torque for a rigid body with fixed-axis rotation.
Torque can be considered as the rotational counterpart to force. Since forces change the translational...
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G-protein Coupled Receptors01:21

G-protein Coupled Receptors

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G-protein coupled receptors are ligand binding receptors that indirectly affect changes in the cell. The actual receptor is a single polypeptide that transverses the cell membrane seven times creating intracellular and extracellular loops. The extracellular loops create a ligand specific pocket which binds to neurotransmitters or hormones. The intracellular loops holds onto the G-protein.
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Related Experiment Video

Updated: Mar 17, 2026

A Friction Testing-Bioreactor Device for Study of Synovial Joint Biomechanics, Mechanobiology, and Physical Regulation
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A Friction Testing-Bioreactor Device for Study of Synovial Joint Biomechanics, Mechanobiology, and Physical Regulation

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Forum.

H H Nuss1, L S Smith2, F P White3

  • 1a Middle Tennessee Podiatric Medical Association Hendersonville , Tennessee.

The Physician and Sportsmedicine
|July 19, 2016
PubMed
Summary
This summary is machine-generated.

This section invites readers to share unique medical treatments, opinions on controversial topics, or insights from patient cases. Submit your ideas and interesting figures to THE PHYSICIAN AND SPORTSMEDICINE for publication.

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Area of Science:

  • Medical Practice
  • Reader Engagement
  • Clinical Trends

Background:

  • The "Forum" section serves as a platform for reader feedback and discussion.
  • It encourages the sharing of diverse perspectives within the medical community.

Purpose of the Study:

  • To solicit reader contributions on various medical topics.
  • To foster a dynamic exchange of ideas and clinical experiences.

Main Methods:

  • Readers are invited to submit their unique treatment methods for common medical problems.
  • Submissions can include opinions on controversial subjects or responses to published articles.
  • Sharing new trends identified through case studies or patient series is also encouraged.

Main Results:

  • A collection of reader-submitted content will be published.
  • Diverse viewpoints and practical clinical insights will be shared.

Conclusions:

  • The "Forum" aims to enrich the journal's content with reader-generated material.
  • It promotes active participation and knowledge dissemination among healthcare professionals.